Photolysis of Uranium, Neptunium, and Plutonium Ions in Propionic Acid Solutions

IF 0.9 Q4 CHEMISTRY, INORGANIC & NUCLEAR Radiochemistry Pub Date : 2024-12-11 DOI:10.1134/S1066362224050023

A. M. Fedoseev, V. P. Shilov

引用次数: 0

Abstract

The photolytic reactions of U(VI), Np(VI, V), and Pu(VI) in 0.5–13 M C₂H₅COOH solutions were studied. Under UV irradiation, U(VI) is reduced to U(IV); Np(VI), to Np(V); Np(V), to Np(IV); and Pu(VI), to Pu(IV) and Pu(III). The photochemical reduction of U(VI) in concentrated propionic acid to U(IV) under UV irradiation is fast and complete. The Np(V) reduction proceeds with an induction period, after which the reaction accelerates. This is due to the fact that Np(V) weakly absorbs in the UV range. The appearance of Np(IV) leads to the formation of a Np(V)–Np(IV) cation–cation complex. The complex absorbs light, its energy excites Np(V), and Np(V) reacts with the acid. The photoreduction of Np(VI) proceeds without an induction period, because Np(VI) significantly absorbs UV light. Pu(VI) under UV irradiation is reduced to Pu(IV) and finally to Pu(III).

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铀、镎和钚离子在丙酸溶液中的光解

研究了U（VI）、Np（VI， V）和Pu（VI）在0.5 ~ 13 M C2H5COOH溶液中的光解反应。在紫外线照射下，U（VI）还原为U(IV)；Np(VI)，到Np(V)；Np(V)，到Np(IV)；和浦（六），到浦（四）和浦（三）。浓丙酸中U（VI）在紫外照射下光化学还原为U（IV）快速而彻底。Np(V)还原过程有一个诱导期，诱导期后反应加速。这是由于Np(V)在紫外范围内吸收较弱。Np（IV）的出现导致形成Np(V) -Np （IV）阳离子配合物。配合物吸收光，其能量激发Np(V), Np(V)与酸发生反应。Np（VI）的光还原过程没有诱导期，因为Np（VI）对紫外光有明显的吸收。Pu（VI）在紫外线照射下还原为Pu(IV)，最后还原为Pu（III）。

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来源期刊

Radiochemistry CHEMISTRY, INORGANIC & NUCLEAR-

CiteScore

1.30

自引率

33.30%

发文量

期刊介绍： Radiochemistry is a journal that covers the theoretical and applied aspects of radiochemistry, including basic nuclear physical properties of radionuclides; chemistry of radioactive elements and their compounds; the occurrence and behavior of natural and artificial radionuclides in the environment; nuclear fuel cycle; radiochemical analysis methods and devices; production and isolation of radionuclides, synthesis of labeled compounds, new applications of radioactive tracers; radiochemical aspects of nuclear medicine; radiation chemistry and after-effects of nuclear transformations.